A surface active agent; any wetting agent. A formulation which, when added to water in proper amounts, will materially reduce the surface tension of the water and increase penetration and spreading abilities of the water.

An incendiary mixture with a jelling agent used in flamethrowers and bombs.

A representation of the vegetative cover and fuel in a base area. Used in the calculation of fire danger rating.

A resource that includes a dozer, its transportation unit and a standard complement of personnel for its operation.

The physical, biological, and ecological impacts of fire on the environment.

Aerial photographs corrected to scale such that geographic measurements may be taken directly from prints. They may contain graphically emphasized geographic features and may be provided with overlays of such features as: water systems, facility location, etc. 

Photograph obtained from the orthogonal (i.e., horizontal) projection of a correctly oriented stereoscopic model formed by two overlapping aerial photographs; an orthophoto is free of tilt and relief displacements.

The two-category (evergreen, deciduous) classification of shrubs vegetation in the 1988 version of NFDRS.

Material (usually a flammable liquid) used to initiate or increase the spread of a fire.

Chipping or pitting of concrete, masonry, or stone surfaces.